The United States Northern Command, the expansive military headquarters established in the aftermath of 9/11 to protect all American territory — in the air, on land, and at sea — is now tracking hurricanes, floods, droughts, wildfires, even major public gatherings. In regular exercises it is preparing to respond to nearly every conceivable event where federal troops might be needed to assist civilian authorities. It is being asked to do more than ever anticipated, according to current and former commanders.
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